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-rw-r--r--Mailman/Utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Mailman/Utils.py b/Mailman/Utils.py
index 18b1c468..d4319026 100644
--- a/Mailman/Utils.py
+++ b/Mailman/Utils.py
@@ -200,7 +200,7 @@ def LCDomain(addr):
# TBD: what other characters should be disallowed?
-_badchars = re.compile(r'[][()<>|;^,\000-\037\177-\377]')
+_badchars = re.compile(r'[][()<>|;^,%!\000-\037\177-\377]')
def ValidateEmail(s):
"""Verify that the an email address isn't grossly evil."""